JPH057501A - Injection molding-made arctic boot and production thereof - Google Patents

Abstract

PURPOSE:To improve the heat-retaining and-insulating properties of the title boot by not causing the compression strain to foamed resin with heat-insulating and flexible properties, by a method wherein the whole surface of knit cloth into which thermoplastic resin injected does not permeate is coated with a resin into which the thermoplastic resin injected is not allowed to permeate. CONSTITUTION:A lining material 1 is formed as follows, that is to say, foamed resin 3 with heat-insulating and flexible properties is put between specific knit cloth 8 and ordinary knit cloth 6, and a material layered by sticking them together is cut out in the shape of the illustration shown. In this case, the whole surface of the knit cloth 8 is coated with a synthetic resin material into which thermoplastic resin injected is not allowed to permeate, and thus the thermoplastic resin injected is not allowed to permeate into the knit cloth 8. The lining material 1 cut out in the above-mentioned shape is wrought by sewing 4 and is made into a lining 2 in the shape of a sock, and it is put on a last 5 for an injection molding die. The lining 2 is composed so that the knit cloth 6 is on the inside of the lining 2 and the knit cloth 8 coated with the synthetic resin material is on the outside thereof, and the lining 2 is put on the last 5 so that the side of the knit cloth 6 faces the last 5. After that, thermoplastic resin 7 such as polyvinyl chloride is injected around the last 5, and thus the title boot is molded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection-molded boot provided with a back cloth material having an excellent heat retaining property.

[0002]

2. Description of the Related Art Conventionally, there are various boots having excellent heat retention. For example, a backing material having a pile-like cloth, a boot molded through a heat insulating synthetic resin foam,
There is a method for producing a cold-proof injection-molded boot (see Japanese Patent Publication No. 61-1121) in which workability is not hindered and a heat-retaining backing material having a bore is used as the backing material.

[0003]

However, in the above-mentioned prior art, the back cloth material has a bore (fluffy raised hair).
If so, these flocs are caught in the flow of resin during injection molding and run on the surface of the boot to expose linear scratches, resulting in a marked deterioration in appearance quality.
In addition, a boot with a heat insulating and flexible synthetic resin foam is effective for a rubber product that does not involve high pressure during molding, but when a thermoplastic synthetic resin is injected and integrated with a backing material, When the synthetic resin penetrates into the heat-insulating and flexible synthetic resin foam by penetrating the cloth material, it is pressed against the last of the mold and compressed, so that when the boot is removed from the mold Since the foam does not recover as compressed, the heat insulation property is halved.
In the method for manufacturing a cold weather injection-molded boot disclosed in Japanese Patent No. 1121 No. 1121, since the injected thermoplastic synthetic resin composition is directly adhered to a foam sheet, the thermoplastic synthetic resin is a heat insulating and flexible synthetic resin. The foam is compressed in the mold because it penetrates the foam sheet and is molded in this penetrated state. Therefore, even if it is removed from the mold, it remains compressed, the thickness becomes thin, and the air layer part also decreases,
There was a problem that the heat retaining property was halved. In view of this point, the present invention has a simple structure and a synthetic resin material or the like that does not allow the injected thermoplastic synthetic resin to penetrate, and a knitted cloth that does not allow the injected thermoplastic synthetic resin to penetrate and a normal knit fabric. Adhered to the last so that the knitted cloth that does not penetrate the thermoplastic synthetic resin injected through the backing material through the heat insulating and flexible synthetic resin foam is the outer side (to be the lining) It is an object of the present invention to provide a boot formed by injecting a thermoplastic synthetic resin.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and in a cold-proof injection-molded boot and a method for manufacturing the same, a back cloth material sewn into a foot shape is used as the last of an injection-molding die. In the method of manufacturing an injection-molded boot that is adhered to and is injected with a thermoplastic synthetic resin to be integrated with a backing material,
Heat-insulating, flexible synthetic resin foam between a knitted fabric that does not allow the injected thermoplastic synthetic resin to penetrate and a normal knitted fabric that is coated with a synthetic resin material that does not allow the injected thermoplastic synthetic resin to penetrate. The technical means of injecting the thermoplastic synthetic resin by applying the back cloth material to the last so that the knitted fabric that does not allow the injected thermoplastic synthetic resin to permeate outside (to become the lining) through It was adopted.

[0005]

According to the present invention, by adopting the above technical means, the injected thermoplastic synthetic resin is prevented from permeating one surface of the knitted fabric which has a simple structure and does not permeate the injected thermoplastic synthetic resin. Since the resin is applied, the thermoplastic synthetic resin does not penetrate into the heat-insulating and flexible synthetic resin foam, so when it is molded, the foam does not return to its original state as compressed, so it has extremely high heat retention. Is obtained.

[0006]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference numeral 1 shown in FIG. 1 is a knitted fabric (lining) 8 and a normal knitted fabric (outer fabric) that are coated with a synthetic resin material that does not allow the injected thermoplastic synthetic resin to penetrate and that do not allow the injected thermoplastic synthetic resin to penetrate. 6 is a back cloth material showing a state in which a heat-insulating and flexible synthetic resin foam 3 is interposed between the laminated material and 6 and the laminated material is cut into a foot shape. A knitted fabric (lining) 8 that does not allow the injected thermoplastic synthetic resin to permeate is a vertical knit,
A synthetic resin material or the like applied to the knitted fabric 8 so as to prevent the injected thermoplastic synthetic resin from penetrating with a weft knit or the like is a natural or synthetic latex, or an acrylic resin material, which has a heat insulating property. The flexible synthetic resin foam 3 may be any synthetic resin foam (foam) having heat insulating properties and flexibility, and examples thereof include polyurethane foam, polyethylene foam, and polyvinyl chloride foam. . It is preferable that the heat insulating and flexible synthetic resin foam 3 has a thickness of about 0.5 to 7 in consideration of workability of hanging it on the last 5 and a fit state. The knitted fabric (outer fabric) 6 in contact with the last 5 may be an ordinary weft knit, a vertical knit, a pile-like material, etc., as long as the knitted fabric has a malleability and strength so that the knitted fabric can be hung on the last 5 and can be attached and detached. In order to bond the knitted fabric 8 which does not allow the injected thermoplastic synthetic resin to permeate, the heat insulating and flexible synthetic resin foam 3 and the ordinary knitted fabric (outer fabric) 6, a conventional means using an adhesive may be used, or a foam The surfaces may be melted by heating and pasted together, or a frame laminating method may be used. The laminated backing material 1 has heat insulating properties, and the flexible synthetic resin foam 3 has appropriate elasticity, so that the knitting fabrics 6 and 8 can be easily attached to the last 5 without impeding the elongation thereof. it can. Further, the method of applying the synthetic resin material so as to prevent the injected thermoplastic synthetic resin from penetrating may be a conventionally known method such as lapping with feathers or the like, or application with an applicator. A sock-shaped backing cloth 2 is sewn with the back cloth material 1 cut into a foot shape as shown in FIG. 2, and the sock-like backing cloth 2 is hung and attached to the last 5 for the injection mold as shown in FIG. At this time, the knitted fabric (outer fabric) 6 becomes the inner side (outer fabric) of the sock-shaped backing fabric 2, and the synthetic resin material applied to the knitted fabric 8 impervious to the thermoplastic synthetic resin,
For example, so that the synthetic latex is on the front side (lining),
The sock-shaped backing cloth 2 is constituted and attached so that the knitted cloth (outer fabric) 6 side faces the last 5. After deposition, a thermoplastic synthetic resin 7 such as polyvinyl chloride is injected around the last 5 in the usual manner to form a boot as shown in FIG. In the sock-shaped lining fabric 2 of the present invention, the portion 9 corresponding to the sole of the foot
It goes without saying that it is also good to compose the material of the other material such as felt. Further, the one shown in FIG. 5 is the same as that described above, but when the AA cut thermoplastic synthetic resin 7 of FIG. 4 is injected around the last 5 to form the boot, the AA is obtained. A knitted fabric 8 that does not allow the injected thermoplastic synthetic resin 7 to penetrate the cut thermoplastic synthetic resin 7 and the injected thermoplastic synthetic resin 7 that does not penetrate the injected thermoplastic synthetic resin 7. FIG. 3 is an enlarged cross-sectional view showing a fusion state of the resin foam 3 and a normal knitted fabric (outer fabric) 6, showing the state of the invention of the present application, and since it does not penetrate at all, the synthetic resin foam is compressed and molded, and thus is the last. When the foam is removed from No. 5 and put into a use state, the foam is restored and the thickness is about the same as before molding, so that the heat retaining and heat insulating effects are good. The reason why it is configured as in the present invention is that even if a knitted fabric that does not allow the injected thermoplastic synthetic resin to penetrate, it actually penetrates a little from the stitch due to the knitted fabric, so a synthetic resin material that does not penetrate is used. It is to be applied. Needless to say, the knitted fabric 8 that does not allow the injected thermoplastic synthetic resin to penetrate does not have to be coated with a synthetic resin material or the like on either one side, but may be coated on both sides. Further, FIG. 6 shows a molten state when a conventional backing material is used.

[0007]

According to the present invention, the following effects can be obtained based on the above configuration. (1) Since the knitted fabric not only does not allow the thermoplastic synthetic resin to permeate, but also the synthetic resin material that does not allow the molten resin to permeate is applied to one side of the knitted fabric, a heat insulating and flexible synthetic resin foam is formed. Since it is not compressed and is restored to almost the same thickness after molding, its heat retention and heat insulating properties are extremely good. (2) The sock-like backing cloth is composed of a knitted fabric and a laminated sheet of heat insulating and flexible synthetic resin foam, but since the heat insulating and flexible synthetic resin foam has stretchability, it is the last. There is no difficulty in suspending the work into the socks, and it has the same workability as the conventional sock-like lining fabric made of a single knit fabric. (3) Since the injected thermoplastic synthetic resin is prevented from penetrating by the lining, the thermoplastic synthetic resin does not seep into the foam as well as into the foam, and the feel and heat retention are excellent. (4) Since the backing material of the obtained boot is made of a synthetic resin foam having a high heat insulating property and a knitted cloth, it has an extremely excellent heat retaining property and is suitable as a cold weather boot.

[Brief description of drawings]

FIG. 1 is a plan view showing a state in which a backing material of the present invention is cut into a foot shape.

FIG. 2 is an explanatory view of a sock-like sewn state of the present invention.

FIG. 3 is a cross-sectional view of the back cloth of the present invention suspended in the last.

FIG. 4 is a cross-sectional view of the manufactured boot of the present invention.

5 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 6 is an enlarged cross-sectional view showing a molten state when a conventional backing material is used.

[Explanation of symbols]

1 Backing material 2 Socks-like backing material 3 Insulation and flexible synthetic resin foam 4 Seams 5 Last 6 Knitted fabric (outer material) 7 Thermoplastic synthesis Resin 8 ... Knitted fabric (lining) that does not allow the injected thermoplastic synthetic resin to penetrate 9 ... ・ Parts that correspond to the soles 10 ... Resin material that does not allow the molten resin to penetrate

Claims (2)

[Claims] 1. A method of manufacturing an injection-molded boot in which a back cloth material sewn in a foot shape is adhered to the last of an injection molding die and a thermoplastic synthetic resin is injected to be integrated with the back cloth material.
Heat-insulating, flexible synthetic resin foam between a knitted fabric that does not allow the injected thermoplastic synthetic resin to penetrate and a normal knitted fabric that is coated with a synthetic resin material that does not allow the injected thermoplastic synthetic resin to penetrate. It is characterized in that the knitted fabric that does not allow the injected thermoplastic synthetic resin to permeate the back cloth material through the outer side is attached to the last (so as to become the lining) and the thermoplastic synthetic resin is injected. Method for manufacturing cold weather injection molded boots. 2. In an injection-molded boot in which a thermoplastic synthetic resin is injected to be integrated with a backing material, a synthetic resin material or the like that does not allow the injected thermoplastic synthetic resin to penetrate is applied to one surface of the injected thermoplastic resin. Knitted fabric that does not penetrate the synthetic resin and ordinary knitted fabric, which has a heat-insulating and flexible synthetic resin foam interposed between them Cold-proof injection-molded boots that are located on the side facing the plastic synthetic resin (lining).